a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c=( )
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a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c=( )
a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c=( )
a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c=( )
a=80÷(5+7+4)×5=25
b=80÷(5+7+4)×7=35
c=80÷(5+7+4)×4=20
a=(25 ),b=( 35 ),c=( 20 )